15-3r=-12

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Solution for 15-3r=-12 equation: 


Simplifying
15 + -3r = -12

Solving
15 + -3r = -12

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '-15' to each side of the equation.
15 + -15 + -3r = -12 + -15

Combine like terms: 15 + -15 = 0
0 + -3r = -12 + -15
-3r = -12 + -15

Combine like terms: -12 + -15 = -27
-3r = -27

Divide each side by '-3'.
r = 9

Simplifying
r = 9

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